Writers! You've been here. You've lived this.
You're writing a scene. You know what it's going to be. You're happy (enough) with it. Could it be more? Sure. But you're content with what you've got. Maybe you're planning to come back in the next draft and spice things up a bit. Add a little fireworks to the mix, that sort of thing.
Then, without meaning to, you start daydreaming about Elmer Fudd. And you ask yourself, "what would Bugs Bunny do?"
And, just like that, you've gone from content to awesome.